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You are watching: 9 – 3 ÷ 1/3 +1 =

Posted march 17, 2016 by Presh Talwalkar. Read about me, or email me.

A current test uncovered only 60% of Japanese 20 year olds to be able to settle the adhering to question. In the 1980s a study discovered 90% might solve it. The autumn in performance led to quite a stir.

Can you number it out?

Watch the video for mine explanation the the correct answer.

9 – 3 ÷ 1/3 + 1 = ? Viral difficulty From Japan. Exactly Answer described

Or keep analysis for a message explanation. . ."All will be well if you use your mind for her decisions, and mind only your decisions." since 2007, ns have dedicated my life to share the joy of video game theory and mathematics. bsci-ch.org now has over 1,000 cost-free articles through no ads many thanks to ar support! aid out and get early accessibility to short articles with a pledge top top Patreon.

. . . . . . . . . . . . . . . . . . *For those that cannot watch, the exactly answer is 1.

The most common mistake is creating the 1/3 as:

9 – 3 ÷ 1/3 + 1

Most calculators will certainly not team the 1/3, therefore the calculator evaluates:

9 – 3/1/3 + 1 = 9 – 3/3 + 1 = 9 – 1 + 1 = 9

The correct answer is uncovered by group 1/3 v parentheses and also following the stimulate of operations, with division taking precedence.

9 – 3 ÷ (1/3) + 1 = 9 – 9 + 1 = 0 + 1 = 1

The correct answer is 1.

Full examine (in Japanese, see page 20 the document). I relied on the English source provided above and also Google translations other Japanese media who taken the statistics. Https://www.chukeiren.or.jp/wp/wp-content/uploads/assets/policy_proposal/pdf/01.Teigensyo.pdf

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I run the bsci-ch.org channel on YouTube, which has actually over 1 million subscribers and 200 million views. Ns am likewise the writer of The happiness of video game Theory: An arrival to strategic Thinking, and several other books which are obtainable on Amazon.

(As you could expect, the links for my publications go to your listings on Amazon. Together an Amazon Associate i earn from qualifying purchases. This go not impact the price friend pay.)

By means of history, I started the Mind her Decisions blog ago in 2007 come share a little bit of math, personal finance, personal thoughts, and game theory. It"s been quite a journey! I thank everyone that has actually shared mine work, and also I am very grateful for coverage in the press, consisting of the Shorty Awards, The Telegraph, Freakonomics, and also many other popular outlets.

I studied Economics and Mathematics at Stanford University.

People frequently ask how I do the videos. Like plenty of YouTubers i use renowned software come prepare mine videos. You have the right to search for computer animation software tutorials top top YouTube come learn exactly how to make videos. Be prepared--animation is time consuming and also software have the right to be expensive!

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Book ratings are from June 2021.

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Mind your Decisions is a compilation the 5 books:

(1) The delight of video game Theory: An introduction to strategy Thinking (2) 40 Paradoxes in Logic, Probability, and also Game theory (3) The Irrationality Illusion: just how To make Smart Decisions and Overcome bias (4) The ideal Mental math Tricks (5) Multiply number By illustration Lines

The pleasure of game Theory shows exactly how you deserve to use mathematics to out-think your competition. (rated 4.2/5 stars top top 200 reviews)

40 Paradoxes in Logic, Probability, and also Game Theory consists of thought-provoking and counter-intuitive results. (rated 4.1/5 stars on 30 reviews)


The Irrationality Illusion: how To do Smart Decisions and also Overcome Bias is a handbook that defines the countless ways we space biased around decision-making and offers approaches to do smart decisions. (rated 4/5 stars ~ above 17 reviews)


The ideal Mental math Tricks teaches just how you have the right to look choose a mathematics genius by solving troubles in her head (rated 4.2/5 stars ~ above 57 reviews)


Multiply number By drawing Lines This book is a reference overview for my video that has over 1 million see on a geometric method to multiply numbers. (rated 4.1/5 stars top top 23 reviews)


Mind your Puzzles is a collection of the 3 "Math Puzzles" books, volumes 1, 2, and 3. The puzzles topics encompass the mathematical subjects including geometry, probability, logic, and game theory.

Math Puzzles Volume 1 features classic mind teasers and also riddles with finish solutions for troubles in counting, geometry, probability, and game theory. Volume 1 is rated 4.4/5 stars on 75 reviews.

Math Puzzles Volume 2 is a sequel publication with more great problems. (rated 4.3/5 stars ~ above 21 reviews)

Math Puzzles Volume 3 is the 3rd in the series. (rated 4.3/5 stars on 17 reviews)


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